| AAPA | American Association of Port Authorities, Americké združenie prístavných úradov (angl.skr.) |
|---|---|
| ABA | Australian Broadcasting Authority |
| AC | author's correction (skr.), autorská korektúra (angl.skr.) |
| AC | authorization certificate (skr.) |
| AD | Authorized Distributor |
| ADS | Authoritative Data Sources |
| AEA | Atomic Energy Authority (skr.) |
| APOLLO | postava v komikse The Authority od Wildstorm Comics |
| ATC | Autodesk Authorised Training Centre (skr.) |
| BSA | Broadcasting Standards Authority |